Align Object to Face & then Center to that Face
@Stphnl329 has answered your question, but there's an alternative route to making your holes, which is quicker than punching them out, and less destructive. (You can continue making adjustments up to a later stage)
Supposing you want to make 24 holes..

Start with a cylinder with 4 * 24 segments, and select a slice 4 segments across on the Y axis, delete the rest.

On your slice,

CtrlX dissolve the edges around the center
Poke the cleared face
CtrlShiftB bevel out the middle vertex
GG ease the surrounding vertices out a bit. (You can do this symmetrically by numerically entering the slide factor). Don't scale. That would disrupt the curvature. For perfection, you would rotate.
(Shipped Add-On) Loop Tools &gt; Circle ensure the central face is circular, and delete it.


Recreate the cylinder with an object-offset Array modifier, based on an Empty at the origin, rotated by 360/24 degrees in Z. Ensure 'Merge' and 'First and Last' are checked.

Assign Solidify, Bevel (by angle), and Subdivision Surface modifiers.